參數(shù)資料
型號(hào): DS5000FP-16
廠商: DALLAS SEMICONDUCTOR
元件分類: Microcontroller
英文描述: 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數(shù): 20/22頁
文件大?。?/td> 592K
代理商: DS5000FP-16
DS5000FP
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POWER MANAGEMENT
The DS5000FP monitors power to provide Power-fail Reset, early warning Power-fail Interrupt, and
switch-over to lithium backup. It uses the Lithium cell at VLI as a reference in determining the switch
points. These are called VPFW, VCCMIN, and VLI respectively. When VCC drops below VPFW, the DS5000FP
will perform an interrupt vector to location 2Bh if the power-fail warning was enabled. Full processor
operation continues regardless. When power falls further to VCCMIN, the DS5000FP invokes a reset state.
No further code execution will be performed unless power rises back above VCCMIN. CE1 , CE2 , R/ W go
to an inactive (logic 1) state. Any address lines that are high (due to encryption) will follow VCC, except
for BA14, which is lithium backed. VCC is still the power source at this time. When VCC drops further to
below VLI, internal circuitry will switch to the lithium cell for power. The majority of internal circuits will
be disabled and the remaining nonvolatile states will be retained. Any devices connected to VCCO will be
powered by the lithium cell at this time. VCCO will be at the lithium battery voltage less a diode drop.
This drop will vary depending on the load. Low leakage SRAMs should be used for this reason. When a
module is used, the lithium cell is selected by Dallas so absolute specifications are provided for the switch
thresholds. When using the DS5000FP, the user must select the appropriate battery. The following
formulas apply to the switch function.
VPFW = 1.45 * VLI
VCCMIN = 1.40 * VLI
VLI Switch = 1.0 * VLI
MEMORY MAP OF THE DS5000FP Figure 2
相關(guān)PDF資料
PDF描述
DS5000T-32-16 8-BIT, 16 MHz, MICROCONTROLLER, DIP40
DS5000T-8-16 8-BIT, 16 MHz, MICROCONTROLLER, DMA40
DS5000T-8-8 8-BIT, 8 MHz, MICROCONTROLLER, PDIP40
DS5000T-8-12 8-BIT, 12 MHz, MICROCONTROLLER, PDIP40
DS5001FP-16 8-BIT, 16 MHz, MICROCONTROLLER, PQFP80
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